Snow also is known to influence the movement of sound waves.When there is fresh snow on the ground，the surface of the snow takes in，or absorbs，sound waves.However，snow can become hard and flat as it becomes older or if there have been strong winds.Then the snow’s surface will help to send back sound waves.Under these conditions，sounds may seem clearer and travel farther.

　　Generally，the color of snow and ice appears white.This is because the light we see from the sun is white.Most natural materials take in some sunlight.This gives them their color.However，when light travels from air to snow，some light is sent back，or reflected.Snow crystals have many surfaces to reflect sunlight.Yet the snow does take in a little sunlight.It is this light that gives snow its white appearance.

　　1．What plays a major role in determining the shape of snow crystals？(no more than 8 words)

　　________________________________________________________________________

　　2．What are the two designs snow crystals grow in？(no more than 4 words)

　　________________________________________________________________________

　　3．Under what conditions can sounds travel a shorter distance，fresh snow or old snow？(no

　　more than 2 words)

　　________________________________________________________________________

　　4．Generally，what is the color of snow？(no more than 2 words)

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